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Dave Milward, Ken Hopkins, Richard Pitwon
2nd International Symposium on Photonic PackagingMesse Mnchen
13th
November 2008
PLUGGABLE INTERCONNECT TECHNOLOGY FORELECTRO-OPTICAL PCBS
RESEARCH AND DEVELOPMENT SYNOPSIS
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Research objectives
Commercial design benefits of optical waveguides
Optical backplane connection architecture
Electro-optical backplane design
Active pluggable optical connector
Demonstration assembly
OVERVIEW
Research and Development Overview | Richard Pitwon
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STORAGE SYSTEM TRENDS
Data storage systems increasing in complexity, densityand speed
Storage demand increasing
Manage more storage
Increased complexity
Data rates increasing
Data access speeds:
3 Gb/s SAS 6 Gb/s SAS
10 Gb/s Gigabit Ethernet
12 Gb/s SAS
Disk sizes decreasing
3.5 2.5 1.8 1
Increased system density
Research and Development Overview | Richard Pitwon
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XYRATEX OPTICAL RESEARCH AND DEVELOPMENT
Key Research Objectives
Investigate optical PCB technology
Identify technology challenges
Develop optical PCB and connector technology
Integrate OPCB backplanes into storage systems
Drive commercial proliferation
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5
LAYOUT DESIGN ADVANTAGES
Source: IBM Zrich Source: ExxelisSource: Exxelis
Splitters
1 n signal power splitters possible
n determined by loss budget
Crossovers
Trace crossovers possible on same layer
Different crossover angles possible
Research and Development Overview | Richard Pitwon
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LAYOUT DESIGN ADVANTAGES
Right Angled bends (in-plane)
Avoids minimum bend radius restrictions
Allows high density routing solutions
Right Angled bends (out-of-plane)
Eases optical signal insertion / extraction
Optical vias possible
Research and Development Overview | Richard Pitwon
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REDUCTION IN POWER CONSUMPTION
High speed optical signal drivers require less power
Comparison of photonic drivers with high speed electronic signal drivers:
Altera PowerPlay to simulate XAUI interface against
Current power consumption specs for VCSEL, VCSEL drivers, photodiodes,
TIA/LA
57% power reduction in high speed signal drivers @ 10 Gb/s
ElectronicSignal driver
10 Gb/sdata stream
10 Gb/s datastream
OpticalSignal driver
Research and Development Overview | Richard Pitwon
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SIZE AND WEIGHT REDUCTION IN OPTICAL PCBS
All electronic
PCB
Electro-
optical PCB
Total size
reduction:55%
Reduce layersby 40%
Reduce areaby 25%
PCB thickness reduction
Higher density and crossover solutions allow:
Reduction in PCB layer count
At least 40% reduction in thickness
PCB area reduction
Increased bandwidth density allows:
Reduction in functional area of I/O
At least 25% reduction in board area
Research and Development Overview | Richard Pitwon
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OPTICAL BACKPLANE CONNECTION ARCHITECTURE
BackplaneLens
Interface
Parallel optical
transceiver
Connector
housing
Copper layers
FR4 layers
Optical layer
Backplane and Line Cards Orthogonal
Research and Development Overview | Richard Pitwon
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VCSEL array PIN array
OPTICAL BACKPLANE CONNECTION ARCHITECTURE
Butt-coupled connection approach without 90 deflection optics
Waveguide illuminated through
butt-coupled fibre connection
Research and Development Overview | Richard Pitwon
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ELECTRO-OPTICAL BACKPLANE DESIGN
Compact PCI
bus connectors
Optical
connector sites
Multilayer electro-optical PCB
Research and Development Overview | Richard Pitwon
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Compact PCI slots
for line cards
Optical
Waveguide
layout
Optical Layer
Electro-Optical Backplane
Compact PCI architecture
10 electrical layers for power
and C-PCI bus signals
1 optical layer for 10 Gb/s traffic
4 optical PCB connector sites
C-PCI slots for line cards Compact PCIslot for Single
Board
Computer
ELECTRO-OPTICAL BACKPLANE DESIGN
Research and Development Overview | Richard Pitwon
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MicrocontrollerSamtec field
array
connector
Spring loaded
platform
Parallel Optical Transceiver
Small form factor
Quad transceiver
10 Gb/s per channel
Microcontroller with I
2
C interface
Backplane Connector Module
Automated connector mechanism
High precision alignment
ACTIVE PLUGGABLE OPTICAL CONNECTOR
Research and Development Overview | Richard Pitwon
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Engagement process
Optical transceiver interface floats
Backplane receptacle funnels connector
Cam followers force optical interface up
Optical transceiver lens butt-couples to
backplane lens
ACTIVE PLUGGABLE OPTICAL CONNECTOR
Undocked Docked
Cam track
Cam followers
Research and Development Overview | Richard Pitwon
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HIGH SPEED SWITCHING LINE CARD
XFP ports
8 x 8
Crosspoint
switch
SMP connector
sites
Transceiver
programming port
Compact PCI bus
connector
FPGA
Array connector for
pluggable active optical
connector
PCI Bridge
XFP ports
Research and Development Overview | Richard Pitwon
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DEMONSTRATION ASSEMBLY
Electro-optical
backplane
Pluggable optical
backplane connectors
High speed switch
line cards
Compact PCI
chassis
Single board
computer
XFP front end
Research and Development Overview | Richard Pitwon
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Crosspoint Switch control
Remote log-in
XFP controls
DEMONSTRATOR MANAGEMENT SOFTWARE
GUI control interface
Remote admin
XFP control
Crosspoint switch configuration
Full transceiver control (VCSEL/PIN settings)
Selectable between any line card in system
Research and Development Overview | Richard Pitwon
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OPTICAL RESEARCH AND DEVELOPMENT ACTIVITIES
Storlite Project
Academic industrial collaboration project
UK government (DTI) funded R&D initiative
Purpose: Investigation of optical backplane systemconnection system and prototype development
Duration: June 2003 November 2005
Status: Completed
Candeo Project
Industrial collaboration project
Purpose: Commercialisation of optical backplaneconnection technology
Status: Current
IeMRC OPCB Project
Academic industrial collaboration project
UK government (IeMRC) supported project
Purpose: Investigation into EOPCB manufacturingtechniques
Status: Current
Research and Development Overview | Richard Pitwon
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Aim
Investigate optical backplane technology
Identify key challenges to implementation
Develop technology solutions
Project Funding
Part funded by DTI
Status
Completed in November 2005
Partners
STORLITE PROJECT
Research and Development Overview | Richard Pitwon
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Aim
Investigate multiple methods of fabricating optical waveguides
Identify most suitable method for mass production of optical PCBs
Project Funding / Status
Part funded by IeMRC (EPSRC funding body)
Currently Active
Partners
IeMRC OPCB PROJECT
Research and Development Overview | Richard Pitwon
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Aim
Commercial development of optical backplane connection technology
Based on prototypes developed during DTI LINK project: Storlite
System design and integration of OPCB technology
Project Funding / Status
Part funded by Samtec in Industrial Collaboration Agreement
Currently Active
Partners
CANDEO PROJECT
Research and Development Overview | Richard Pitwon
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ELECTRO-OPTIC PCB DEVELOPMENT CHAIN
Material Sources
Waveguide
Fabrication
Waveguide / process
Characterisation
Electro-Optic
PCB Fabrication
Technology Enablers
Optical
Transceiver
Connector
Design Services
Simulation
System Integrator /
End user
Research and Development Overview | Richard Pitwon
Source: Exxelis
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XYRATEX PRESENCE IN ELECTRO-OPTIC PCB DEVELOPMENT CHAIN
Material Sources
Waveguide
Fabrication
Waveguide / process
Characterisation
Electro-Optic
PCB Fabrication
Technology Enablers
Optical
Transceiver
Connector
Design Services
SimulationCANDEO
Ie
MR
C
OPCB
System Integrator /
End user
STORLITE
IN
TELLEC
TUAL
PR
OPERTY
Research and Development Overview | Richard Pitwon
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Publications
Design and Application of an Optical Backplane Connection
System
(Tec Preview DesignCon 2007)
An Optical Backplane Connection System With Pluggable Active
Board Interfaces
(Conference paper OCSN 2006)
(Xyratex white paper available)
Pluggable Optical Backplane Connector Technology
(Xyratex white paper available)
www.xyratex.com
Intellectual Property
11 patents / patent applications relating to optical PCB interconnect,
communication structures and methodologies
Press Release
Optical Backplane Technology for Drive Arrays(5th January 2006)
PRESS RELEASES, PUBLICATIONS AND PATENTS
Research and Development Overview | Richard Pitwon
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Achievements
SFF pluggable active optical PCB connector prototype constructed:
Transceiver functional, connector mechanically functional
Hybrid electro-optical backplane designed and constructed
Full demonstration assembly constructed:
Electrically, electronically and mechanically functional
Software interface designed and functional
Results
Characterisation results to be available in early 2009
CONCLUSION
Research and Development Overview | Richard Pitwon
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Richard PitwonSenior Photonics Engineer
E-mail: [email protected]
Dave MilwardDevelopment Manager
E-mail: [email protected]
Ken HopkinsHardware Architect
E-mail: [email protected]
XYRATEX OPTICAL RESEARCH AND DEVELOPMENT GROUP
Thank you for your Attention
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